Measuring system



July 1, 1924.

c. T. ALLCUTT MEASURING SYSTEM Filed Sept. 1, 1917 I INVENTOR v (/zesfer .f/U/mf/ WITNESSES:

ATTORNEY Patented July 1, 1 924.

i STATES cns'rnn '1'. .ALLCUTT, or wmxmsnune, rnmvsxnvama, Assrcmon 'ro wmrrne- HOUSE ELECTRIC MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

' App1ication filed September 1, 1917. Serial No. 189,846.

' To all whom it may concern:

' Be it known that I, CHESTER T; ALLCUTT, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Measuring Systems, of which the following is a specification. J

-My invention relates to measuring. systems and particularly to means for, and methods of, determining the maximum value of an alternating-voltage Wave.

1 One object of my invention is to provide a null method of measuring the maximum value ofan alternating-voltage wave.

Another object of my invention isto provide a measuring system of the above indicated character that shall be simple'to connect and efiective in its operation.

In practicing my invention, I provide a hot-cathode rectifier for converting the alternating voltage, the maximum value of x which is to be. determined, into direct or continuous voltage. A source of continuous voltage-is connected to oppose the rectified voltage and a galvanometer is connected therebetween. The continuous fvoltage is varied until the galvanometer indicates a 1 zero readin and the continuous voltage-is measured. The maximum value of the,al-

ternating voltage will correspond to the con: tinuous voltage required to effect a zero reading of the galvanometero By the use of such a system, the volta e or electromotive force wave will not be istorted by reason of the current consumed in the measuring instrument and, thus, it particularly adapts itself to the measurement of peaked alternating-voltage waves.

Fi re 1 of the accom anying drawings is a ia rammatic view '0 a measuring system em odying my invention, and Fig. 2 is a diagrammatic view of a modified form of measuring system embodying my inven- 65 tion.

One terminal of a source 1 of alternating electromotive force or volta e 'is'connected to the anode 2 of a hot-cat ode rectifier 3 the cathode 4 of which is connected to one to terminal of a galvanometer 5. The other terminal of the galvanometer 5 is connected to one terminal of a source 6 of continuous volta e, the other terminal of which is connecte to the other terminal of the source 1 ct altetingvoltage. -A voltmeter 7 is nometer 5 in i'cates zero.

.us of the alternating voltage. Since no curmnesomne SYSTEM.

connected across the terminals of the source 6 of continuous voltage. A source 8 of di-" rect or continuous current is so connected to the cathode '4 of the rectifier 3 as to efiectively heat the same and thus permit it to function properly as a rectifier.

When it is desired to determine the max-L" mum value of the voltage wave of the source 1 of alternating voltage, the source 6 0i continuous volta e is varied until the galva- Under this condition, no current will traverse the galvanometer 5 and the reading of the voltmeter 7 will be an indication of the maximum valrent traverses the galvanometer 5,110 dis tortion. will result, andthe maximum value of relatively high peaked voltage wavesmay be accurately obtained.

In Fig. 2 of the drawings, one terminal of the source 1 of alternating volta e is con nected to the anode 2 of the recti er 3, the cathode 4 of which is connected to one terminal of the galvanometer 5. The other terminal of the galvanometer 5 iscon'nected, through a switch 9, to the cathode 10 of a rectifier 11. The anode 12 of the rectifier 11 is connected to one terminal of the secondary winding 13 of a variable-volta e transformer 14. The other terminal of t e winding 13 is connected to the other terminal'of the source 1 of alternating voltage. -A condenser 15 is connected to one terminal of the winding 13 and to a oint 16 between the switch 9 andthe catho e 10. The primary winding 17 of the-transformer 14 is connectedto a source 18 of alternating voltage. A. voltmeter 19' is connected across the terminals of the winding 17 for the purpose of comparing the voltages of the sources 1 a5 and 18. p v In operation, with the switch 9 open, the condenser 15 will become char ed to the maximum voltage value across t e winding 13, which voltage is proportional 'to the maximum voltage value of the source 18. If this voltage is higher than the peak volta of the source 1, when the switch 9 is c osed, there will be no deflection of the galvanometer 5 because the condenser is already charged to a value above that of the source 1 and is prevented from dischar through the circuit including the source 1 by the rectifier 3.

However, if the maximum voltage value are in the adjustment of the transformer 14 is' reached at which there is no observable deflection of the galvanometer when the switch '9 is closed. The setting of the transformer l4= at this point gives an indication of the value/of the voltage of the source 1.

Bythis method,any two "allies of alternating voltages maybe compared, irrespective of their relative phase-angular relations or frequencies; 7

I do not limit my invention to the particular arrangement illustrated, as it may be variously modified without departing from i the spirit and scope of the invention as set forth in the appended claims.

I claim as my invention: I 1. A measuring system comprising a source of known alternating voltage, a source of unknown alternating voltage, means for converting both of said alternating voltages to unidirectional voltages, a

condenser adapted to be charged by one of said unidirectional voltages and indicating means connected between said means.

2. A measuring system comprising two sources of alternating voltage, two-vacuumbulb converters having the unidirectional voltage sides thereof connected each to each and together being connected in a series circuit including both of said sources of alternating voltage, a condenser connected at one end between said converters and at the other end between said sources of alternating volt age and indicating means connected between said converters.

3. A measuring system comprising two sources of alternating voltage, means for changing said alternatingv voltages to unidirectional voltage, said means having the unidirectional, sides thereof connected together and the alternating-voltage sides thereof connected to said sources, a condenser connected at one terminal between said means and at the other terminal be- "tween said sources, and indicating means disposed between said means.

In testimony whereof, I have hereunto subscribed my name this 21st day of August, 1917.

CHESTER- T. ALLGUT 

